In modern industrial automation, the power supply layer is not a peripheral concern — it is the foundation upon which every other control system layer depends. The Phoenix Contact QUINT-PS/1AC/24DC/20 is a 24 VDC / 20 A single-phase DIN-rail power supply engineered specifically for integration into structured control system architectures. Whether deployed in a PLC-based manufacturing cell, a DCS-driven process plant, or a SCADA-monitored utility substation, this unit delivers the stable, regulated DC power that upstream controllers, I/O modules, communication gateways, and field devices require to operate with precision and reliability.
The QUINT-PS series is Phoenix Contact’s flagship line of industrial power supplies, distinguished by its active power boost capability, which can deliver up to 200% of rated current for 12 ms to trip upstream circuit breakers and protect downstream loads — a critical feature in complex multi-branch control cabinets where selective protection is essential. This capability directly reduces nuisance tripping and simplifies fault isolation during commissioning and live maintenance operations.
Product Specification Table
| Parameter |
Specification |
| System Role |
DC Power Supply — Control Cabinet Power Layer |
| Input Voltage |
85 – 264 VAC (1-phase), 90 – 350 VDC |
| Output Voltage |
24 VDC (adjustable 18 – 29.5 VDC) |
| Rated Output Current |
20 A |
| Rated Output Power |
480 W |
| Power Boost |
Up to 200% (40 A) for selective circuit breaker tripping |
| Efficiency |
≥ 93% at full load |
| Mounting |
DIN rail (EN 60715 TH35) |
| Protection Class |
IP20 |
| Operating Temperature |
-25 °C to +70 °C |
| Communication Interface |
Signal contact (DC OK relay output) for system monitoring integration |
| Approvals |
UL, cUL, CE, GL, DNV, ATEX Zone 2 |
| Dimensions (W × H × D) |
60 × 130 × 125 mm |
| Weight |
Approx. 1.1 kg |
| Warranty |
warranty terms confirmed during quotation — Covered by ZYPLC Quality Assurance Program |
System Compatibility Notes
The QUINT-PS/1AC/24DC/20 is designed to operate as a coordinated element within a layered automation architecture, not as a standalone unit. In a typical control cabinet, this power supply feeds the 24 VDC bus that powers the Phoenix Contact AXL F BK ETH Axioline F bus coupler, which in turn distributes I/O signals across a rack of AXL F DI8/1 DO8/1 digital I/O modules. The CPU layer — often a Phoenix Contact RFC 470 PN 3TX ILC controller or a third-party Siemens S7-300/S7-400 PLC — draws its logic power from the same regulated 24 VDC rail, ensuring voltage consistency across the control and field device layers.
For redundant power architectures, the QUINT-PS/1AC/24DC/20 is paired with a Phoenix Contact QUINT-DIODE/40 redundancy module, enabling two QUINT-PS units to feed a common bus without reverse current flow. This configuration is standard in high-availability applications such as water treatment SCADA panels, substation RTU cabinets, and pharmaceutical batch control systems where unplanned downtime carries significant operational or regulatory consequences.
At the communication layer, the DC OK signal contact of the QUINT-PS/1AC/24DC/20 can be wired directly into a Phoenix Contact FL SWITCH 2008 managed Ethernet switch’s digital input or into a spare DI channel on the local I/O rack, allowing the PLC or DCS to monitor power supply health in real time via PROFINET or Modbus TCP. This system integration of power status into the control logic enables predictive maintenance workflows and automated alarm escalation without additional hardware.
In the HMI layer, operators viewing a Phoenix Contact TP 3057T or Weintek cMT touchscreen panel can visualize power supply status, output voltage trends, and alarm history — all sourced from the PLC tag database that receives the QUINT-PS DC OK signal. This closes the loop between the power layer and the human-machine interface, giving maintenance engineers a complete picture of cabinet health from a single screen.
Terminal block integration is handled through Phoenix Contact PTFIX or UK 5-TWIN distribution terminal blocks, which organize the 24 VDC output into branch circuits for field instruments, solenoid valves, and relay coils. Proper branch circuit design — using Phoenix Contact CB TM1 2A miniature circuit breakers — ensures that the QUINT-PS power boost function can selectively trip individual branch breakers without affecting the rest of the control cabinet, a key advantage in multi-zone process control installations.
Industrial Application Notes
Manufacturing & Assembly Lines: In automotive body shop welding lines and electronics SMT assembly systems, the QUINT-PS/1AC/24DC/20 powers distributed I/O racks mounted at each robot cell. Its wide input voltage range accommodates factory floor voltage fluctuations, while the power boost function ensures that short-circuit faults at individual robot controllers are cleared without shutting down the entire line’s control power.
Power & Utilities: In medium-voltage switchgear panels and substation protection relay cabinets, the QUINT-PS/1AC/24DC/20 supplies 24 VDC to IEC 61850-compliant protection relays, RTUs, and communication gateways. Its ATEX Zone 2 approval makes it suitable for use in gas-insulated switchgear (GIS) environments where explosive atmospheres may be present during maintenance activities.
Oil, Gas & Petrochemical: Offshore platform control rooms and onshore pipeline SCADA panels rely on redundant QUINT-PS pairs to maintain continuous 24 VDC supply to SIL-rated safety instrumented system (SIS) I/O modules. The unit’s -25 °C cold-start capability ensures reliable operation in unheated equipment rooms during winter shutdowns.
Water & Wastewater Treatment: Municipal water treatment SCADA systems use the QUINT-PS/1AC/24DC/20 to power remote I/O stations at pump stations and chemical dosing skids. The DC OK signal contact integrates with the plant’s SCADA historian, enabling long-term power quality trending and proactive replacement scheduling before field failures occur.
Mining & Metallurgy: In underground conveyor drive control panels and surface ore processing PLCs, the QUINT-PS/1AC/24DC/20’s high efficiency (≥93%) reduces heat dissipation in sealed enclosures, extending the service life of adjacent components including I/O modules, communication cards, and relay output modules.
Product Compatibility FAQ
Q1: Can the QUINT-PS/1AC/24DC/20 be used in a redundant power configuration, and what additional components are required?
Yes. For N+1 redundant power architectures, two QUINT-PS/1AC/24DC/20 units are connected in parallel via a Phoenix Contact QUINT-DIODE/40 redundancy module. The diode module prevents reverse current flow between the two supplies and ensures seamless load transfer if one unit fails. Both units should be set to identical output voltages, and each unit’s DC OK contact should be independently monitored by the PLC to enable individual fault detection. This configuration is fully compatible with IEC 61511 SIL 2 power supply redundancy requirements.
Q2: How does the QUINT-PS/1AC/24DC/20 integrate with PROFINET or Modbus TCP-based control architectures for remote monitoring?
The unit provides a potential-free DC OK relay contact (signal contact) that closes when output voltage is within specification and opens on fault or power loss. This contact is wired to a spare digital input on the local I/O rack (e.g., an AXL F DI8/1 module on an Axioline F bus coupler). The PLC maps this DI tag to the PROFINET or Modbus TCP data table, making power supply status available to the SCADA system, HMI, and historian. No additional communication hardware is required, making this system integration approach cost-effective and architecturally clean.
Q3: What does the warranty terms confirmed during quotation cover, and what is the replacement process through ZYPLC?
The warranty terms confirmed during quotation covers manufacturing defects, component failures under normal operating conditions, and output voltage out-of-specification faults. It does not cover damage caused by incorrect installation, overvoltage events beyond the rated input range, or physical damage. To initiate a warranty claim, contact ZYPLC at plc.sales@zyplc.com or +86 19859288691 with the unit’s serial number and a description of the fault. ZYPLC will arrange advance replacement or repair within the warranty period, minimizing system downtime. All warranty units are tested to factory specifications before dispatch.
